<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap" />
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons" />
  <script src=""></script>
  <style>
    @media (prefers-color-scheme: dark) {
      html{
        background-color: #121212;
      }
    }
    @media (prefers-color-scheme: light) {
      html{
        background-color: #fff;
      }
    }
  </style>  
  <title>Yang</title>
</head>
<body>
  <div id="app"></div>
</body>
</html>
